<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <!-- 添加角色按钮区域 -->
            <el-row>
                <el-col>
                    <el-button type="primary" @click="addDialogVisible = true">添加角色</el-button>
                </el-col>
            </el-row>
            <!-- 角色列表区域 -->
            <el-table :data="rolelist" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row :class="['bdbottom', index1==0?'bdtop':'','vcenter']" v-for="(item1, index1) in scope.row.children" :key="item1.id">
                            <!-- 渲染一级权限 -->
                            <el-col :span="5">
                                <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级和三级权限 -->
                            <el-col :span="19">
                                <!-- 通过for循环嵌套渲染二级和三级权限 -->
                                <el-row :class="[index2==0?'':'bdtop','vcenter']" v-for="(item2,index2) in item1.children" :key="item2.id">
                                    <el-col :span="6">
                                        <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <el-col :span="18">
                                        <el-tag type="warning" v-for="item3 in item2.children" :key="item3.id" closable @close="removeRightById(scope.row,item3.id)">{{item3.authName}}</el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column label="#" type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作" width="300px">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.id)">编辑</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeRoleById(scope.row.id)">删除</el-button>
                        <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>
        <!-- 分配权限的对话框 -->
        <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogClosed">
            <!-- 树形控件 -->
            <el-tree ref="treeRef" :data="rightsList" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys">
            </el-tree>
            <!-- 底部区域 -->
            <span slot="footer">
                <el-button @click="setRightDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="allotRights">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 添加角色的对话框 -->
        <el-dialog title="添加角色" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <!-- 内容主体区域 -->
            <el-form :model="addForm" :rules="rolesFormRules" ref="addFormRef" label-width="80px">
                <el-form-item label="角色名称" prop="roleName">
                    <el-input v-model="addForm.roleName"></el-input>
                </el-form-item>
                <el-form-item label="角色描述" prop="roleDesc">
                    <el-input v-model="addForm.roleDesc"></el-input>
                </el-form-item>
            </el-form>
            <!-- 底部区域 -->
            <span slot="footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addRole">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 编辑角色的对话框 -->
        <el-dialog title="编辑角色信息" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <!-- 内容主体 -->
            <el-form :model="editRoleForm" ref="editRoleFormRef" :rules="rolesFormRules" label-width="80px">
                <el-form-item label="角色ID" prop="roleId">
                <el-input v-model="editRoleForm.roleId" disabled></el-input>
                </el-form-item>
                <el-form-item label="角色名称" prop="roleName">
                <el-input v-model="editRoleForm.roleName"></el-input>
                </el-form-item>
                <el-form-item label="角色描述" prop="roleDesc">
                <el-input v-model="editRoleForm.roleDesc"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editRole">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>
<script>
export default {
    data() {
        return {
            //所有角色列表数据
            rolelist:[],
            // 添加角色的表单数据
            addForm: {
                roleName: '',
                roleDesc: ''
            },
            // 添加角色对话框的显示与隐藏
            addDialogVisible: false,
            // 角色表单的验证规则对象
            rolesFormRules: {
                roleName: [
                    { required: true, message: '请输入角色名称', trigger: 'blur' }
                ]
            },
            // 编辑角色的对话框显示与隐藏状态
            editDialogVisible: false,
            // 编辑角色的数据对象
            editRoleForm: {},
            // 控制分配权限对话框的显示与隐藏
            setRightDialogVisible: false,
            // 所有权限的数据
            rightsList:[],
            // 树形控件的属性绑定对象
            treeProps:{
                label:'authName',
                children:'children'
            },
            // 默认选中的节点Id值数据
            defKeys: [],
            // 当前分配角色的id
            roleId: ''
        }
    },
    // 生命周期函数
    created(){
        this.getRolesList()
    },
    methods:{
        // 获取所有角色的列表
        async getRolesList(){
            const {data:res} = await this.$http.get('roles')
            if(res.meta.status !== 200) {
                return this.$message.error('获取角色列表失败');
            }
            this.rolelist = res.data
        },
        // 监听添加角色对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        // 添加角色
        addRole () {
            // 提交请求前，表单预验证
            this.$refs.addFormRef.validate(async valid => {
                // 表单预校验失败
                if (!valid) return
                // 发起添加角色的网络请求
                const { data: res } = await this.$http.post('roles', this.addForm)
                if (res.meta.status !== 201) {
                    this.$message.error('添加角色失败！')
                }
                this.$message.success('添加角色成功！')
                // 隐藏添加角色对话框
                this.addDialogVisible = false
                this.getRolesList()
            })
        },
        // 编辑角色信息的对话框
        async showEditDialog (id) {
            // 查询角色信息
            const { data: res } = await this.$http.get('roles/' + id)
            if (res.meta.status !== 200) {
                return this.$message.error('查询用户信息失败！')
            }
            this.editRoleForm = res.data
            this.editDialogVisible = true
        },
        // 监听编辑角色对话框的关闭事件
        editDialogClosed(){
            this.$refs.editRoleFormRef.resetFields()
        },
        //编辑角色
        editRole() {
            // 提交请求前，表单预验证
            this.$refs.editRoleFormRef.validate(async valid => {
                // 表单预校验失败
                if (!valid) return
                // 编辑提交角色
                const { data: res } = await this.$http.put(
                    'roles/' + this.editRoleForm.roleId,
                    {
                        roleName: this.editRoleForm.roleName,
                        roleDesc: this.editRoleForm.roleDesc
                    }
                )
                if (res.meta.status !== 200) {
                    this.$message.error('更新角色信息失败！')
                }else {
                    // 隐藏编辑角色对话框
                    this.editDialogVisible = false
                    this.$message.success('更新角色信息成功！')
                    this.getRolesList()
                }
            })
        },
        // 根据id删除角色
        async removeRoleById(id) {
            const confirmResult = await this.$confirm('此操作将永久删除该用户, 是否继续?','提示',
                {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }
            ).catch(err => err)
            // 点击确定 返回值为：confirm
            // 点击取消 返回值为： cancel
            if (confirmResult !== 'confirm') {
                return this.$message.info('已取消删除')
            }
            const { data: res } = await this.$http.delete('roles/' + id)
            if (res.meta.status !== 200) return this.$message.error('删除角色失败！')
            this.$message.success('删除角色成功！')
            this.getRolesList()
        },
        // 根据id删除对应的权限
        async removeRightById(role,rightId){
            // 提示是否删除
            const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)

            if(confirmResult !== 'confirm'){
                return this.$message.info('取消了删除！')
            }
            const {data:res} = await this.$http.delete('roles/'+role.id+'/rights/'+rightId)
            if(res.meta.status!==200) {
                return this.$message.error('删除权限失败！')
            }
            role.children = res.data
        },
        // 展示分配权限的对话框
        async showSetRightDialog(role) {
            this.roleId = role.id
            // 获取所有权限数据
            const {data:res} = await this.$http.get('rights/tree')
            if(res.meta.status!==200) {
                return this.$message.error('获取权限数据失败！')
            }
            // 把获取到的权限数据保存到data中
            this.rightsList = res.data

            // 递归获取三级节点的Id
            this.getLeafKeys(role,this.defKeys)
            // 展示对话框
            this.setRightDialogVisible = true
        },
        // 通过递归的形式，获取角色下所有三级权限的id，并保存到defKeys数组中
        getLeafKeys(node,arr) {
            // 如果当前node节点不包含children属性，则是第三级节点
            if(!node.children) {
                return arr.push(node.id)
            }
            node.children.forEach(item => this.getLeafKeys(item,arr))
        },
        // 监听分配权限对话框的关闭事件
        setRightDialogClosed() {
            this.defKeys = []
        },
        // 点击为角色分配权限
        async allotRights() {
            // '...'展开运算符，将一个数组转为用逗号分隔的参数序列
            const keys = [
                ...this.$refs.treeRef.getCheckedKeys(),
                ...this.$refs.treeRef.getHalfCheckedNodes()
            ]
            // 连接所有数组元素后返回一个字符串
            const idStr = keys.join(',')
            const {data:res} = await this.$http.post('roles/'+this.roleId+'/rights',{rids:idStr})
            if(res.meta.status!==200) {
                return this.$message.error('分配权限失败！')
            }
            this.$message.success('分配权限成功！')
            this.getRolesList()
            this.setRightDialogVisible = false
        }
    }
}
</script>
<style lang="less" scoped>
.el-tag {
    margin: 7px;
}
.bdtop {
    border-top: 1px solid #eee;
}
.bdbottom {
    border-bottom: 1px solid #eee;
}
.vcenter {
    display: flex;
    align-items: center;
}
</style>
